Overall, I think my method was sufficient to obtain reliable results. If the graph was a curve with the highest point of resistance with the shortest length, and the lowest point of resistance with the highest length, then the results would show that they are inversely proportional i.
I cannot predict the actual measurements on the graph itself, only the shape it will produce, so any numbers on the graph are to demonstrate direct proportionality only, and not the results I believe will be present.
I can conclude that as the length of resistance putty increases, so does the resistance at the same rate until the resistance putty gets to a certain length and then the increase of resistance slows down.
However, if the carbon putty obeys Ohms law the prediction graph will show the shape of the final graph produced from the results. There are a few data points that are farther away from the line of best fit than the others, but they are still consistent with the general trend.
I will place one crocodile clip at 0cm on the wire and the other at 5cm to complete the circuit.
This prediction is true but my sketched graph was incorrect, as in my final graph I got a curve at the end. I can predict a result to discover how its length affects the resistance of carbon putty.
This could be because I was not being accurate enough with having exactly 8cm of resistance putty and having the width exactly the same as with all the other different lengths.
I will try to make this investigation as accurate as possible. Variables There are different variables that can be changed in this experiment; these are the independent variable.
Roll the carbon putty to the fattest one you can, but make sure that the length is sufficient enough to be used in the experiment e. It was very hard to roll out the resistance putty and keep it all the same width, but as the putty got warmer, it did get slightly easier to roll out.
These experiments would still involve changing just one variable, but instead of having a constant width of 2cm in diameter, the constant width could be 5cm in diameter instead.
Apparatus Ensuring Accuracy To ensure accuracy I will record the voltage and the current three times every 5cm and take the average reading. Measure the diameter and record 3. A steady increase in voltage, in a circuit with constant resistance, produces a constant linear rise in current, as shown in this graph: More essays like this: From looking at my graph, it shows the results are neither inversely or directly proportional.
For example, I could use different types of wire instead of using only nichrome. Whereas a shorter piece of resistance putty can represent a queue at a roundabout.
However, I think that unless I had specialist equipment the results would be distorted because the wire would eventually get very hot. Analysing and Considering Evidence After repeating the experiment several times, I added the three resistance values and averaged them out to get an overall average resistance for each length.
Next, I will set the power pack on the lowest voltage possible to ensure that the current passing through the circuit isn't too high which could potentially affect the results because the wire would get too hot.
If the graph was a curve with the highest point of resistance with the shortest length, and the lowest point of resistance with the highest length, then the results would show that they are inversely proportional i. This will reduce the chance of false readings and will cancel out any anomalous results.
However, due to my line of enquiry, I will only change the length of the wire. I will repeat this method every 5cm until I get up to cm, taking three readings from both the voltmeter and ammeter each time to ensure accuracy.
If the readings differ, our records of resistance will also differ, therefore causing the experiment to be inaccurate. For example, I could use different types of wire instead of using only nichrome.Factors that Affect the Resistance of Resistance Putty This investigation is designed to look into the resistance of different materials, in this case, resistance putty in the form of wires, and their conducting capability in different shapes.
The aim of this investigation is to find out the relationship between resistance and conductive putty, and to see how length of putty affects this relationship.
The Experiment: Conductive putty is specially designed to be a conductor; this is achieved by adding carbon black. Aim: to investigate whether the surface area or the lengths of the carbon putty will affects its resistance Planning I am investigating of whether the length or the surface area.
Factors that Affect the Resistance of Resistance Putty This investigation is designed to look into the resistance of different materials, in this case, resistance putty in the form of wires, and their conducting capability in different shapes.
The resistance of the bulb increases as the current through the bulb increases. From the information of my table from my results I notice that the temperature increase corresponds with the increase in the current passing through the bulb.
Investigating the resistance of resistance wire. Problem: “Investigate one of the factors that effects the resistance of resistance wire” Normal wire is used for conducting electricity; the best wire is the one that gives out the same amount of electricity that was put in.Download